body{
    background-color: #f1f1f1;
}
.box{
    position: relative;
    width: 500px;
    border: 1px solid #000;
    margin: 50px auto;
    padding-top:25px ;
}
span{
    position: absolute;
    left: 20px;
    top: -16px;
    font-size: 24px;
    background-color: #f1f1f1;

}
label,
input{
margin: 16px;
}
.ipn{
    width: 460px;
    height: 30px;
}
.normal{
    width: 470px;
    height: 35px;
    margin: 16px;
}
button{
    width: 465px;
    height: 30px;
    margin: 16px;
    background-color: green;
    border: 0;
    font-size: 16px;
    color: #fff;
}